JP6104733B2 - Clamp sensor and measuring device - Google Patents

Description

  The present invention relates to a clamp sensor configured to be able to clamp an object to be measured with a pair of clamp arms, and a measurement apparatus including the clamp sensor.

  As this type of clamp sensor, a clamp sensor (a receiver for a wiring path exploration device) disclosed in Patent Document 1 below is known. This clamp sensor includes a main body (case) formed so that the front end portion is slightly narrowed in the thickness direction, and a pair of clamp arms (sensor structure). In this case, a housing portion that is open from the tip to the side is provided inside the tip of the main body.

  The pair of clamp arms are disposed in the housing part so as to be able to enter and exit from an opening formed at the tip of the main body part. Specifically, the pair of clamp arms has a semicircular arc portion and is slidably attached to the distal end of a movable body disposed in the main body. Further, the moving body slides within the main body by sliding the operation knob that protrudes to the front side of the main body.

  With this configuration, in this clamp sensor, a pair of clamp arms attached to the tip of the movable body can be moved in and out of the opening by sliding the operation knob. Further, in this clamp sensor, the pair of clamp arms is configured such that the front side opens when it comes out of the housing part formed on the distal end side of the main body part, and the front side closes when it fits in the housing part. Yes. Further, in this clamp sensor, the pair of clamp arms is formed with a space in the central portion through which the wiring to be clamped can be passed when the tip side is closed.

JP 2006-184246 A (page 6, FIG. 1-2)

  However, the clamp sensor has the following problems to be solved. That is, in this clamp sensor, when the wiring is clamped by the pair of clamp arms, the clamp sensor is positioned between the pair of clamp arms in a state of being out of the housing portion formed on the distal end side of the main body (in a state where the distal end is opened). It is necessary to introduce the wiring and slide the operation knob from this state to close the tip while accommodating the pair of clamp arms in the accommodating portion. In this case, when closing the tip, the position of the pair of clamp arms with respect to the main body held by the hand changes. Therefore, in order to clamp the wiring so that the wiring does not escape from between the pair of clamp arms, the clamp sensor is attached to the body of the clamp arm in accordance with the slide operation of the operation knob. There is a problem to be solved that it is difficult to perform the clamping operation because it is necessary to move to the tip side. Further, since the pair of clamp arms must be disposed in the main body so as to be able to enter and leave the housing, there is a problem that the internal structure of the main body is complicated.

  The present invention has been made to solve such a problem, and provides a clamp sensor that can easily perform a clamp operation and avoid the complexity of the internal structure of the main body, and a measuring apparatus including the clamp sensor. The main purpose.

  In order to achieve the above object, the clamp sensor according to claim 1 is a state in which at least one base portion is rotatable at the one end side of the main body portion and at least one end portion of the main body portion. A pair of clamp arms configured such that the at least one tip is openable and closable, and a measurement object can be inserted into a hole formed between the tips when the tip is closed, and the tip An urging portion that constantly urges at least one of the pair of clamp arms in the opening direction, and a slide along the length direction of the portion on the one end side of the main body portion. An open / close cover that is movably fitted, and when the open / close cover is slid toward the pair of clamp arms along the length direction, the pair of clamps from the one end side of the main body portion. The tip of the opening / closing cover extending to the compression arm abuts the outer peripheral surface of the at least one clamp arm, and the at least one clamp arm is rotated against the urging force of the urging portion. When the distal ends of the pair of clamp arms are moved to the closed state and the opening / closing cover is slid to the other end side of the main body along the length direction, the at least one of the opening / closing covers by the distal end portion The rotation against the urging force of the urging portion with respect to the clamp arm is released, and the tips of the pair of clamp arms shift to the open state.

  Further, the clamp sensor according to claim 2 is the clamp sensor according to claim 1, wherein the pair of clamp arms is provided at a portion of the tip end portion of the opening / closing cover that contacts the outer peripheral surface of the at least one clamp arm. And a biasing member that biases the outer peripheral surface of the at least one clamp arm in a direction to maintain the closed state against the biasing force of the biasing portion when the tip is closed. ing.

  A clamp sensor according to a third aspect of the present invention is the clamp sensor according to the first or second aspect, wherein the clamp sensor is either between the open / close cover and the main body, or between the open / close cover and the at least one clamp arm. On one side, a lock mechanism that locks the movement of the main body portion of the opening / closing cover that is slid to the clamp arm side to shift the tip ends of the pair of clamp arms to the closed state Is arranged.

  According to a fourth aspect of the present invention, in the clamp sensor according to the third aspect, the lock mechanism includes a ball plunger disposed in the main body portion and a ball of the ball plunger formed on the opening / closing cover. It is comprised by the engagement recessed part which fits.

  The clamp sensor according to claim 5 is the clamp sensor according to claim 3, wherein the lock mechanism is formed on an engagement claw formed on the tip of the opening / closing cover and the pair of clamp arms. It is comprised by the engagement recessed part in which the said engagement nail | claw fits.

  The clamp sensor according to claim 6 is the clamp sensor according to claim 3, wherein the lock mechanism is a lock lever that is provided on the opening / closing cover and has an engaging convex portion that engages with the one end side. It is configured.

  According to a seventh aspect of the present invention, there is provided a measuring apparatus comprising: the clamp sensor according to any one of the first to sixth aspects; and a measuring unit that measures a measured amount based on a detected amount detected by the clamp sensor. Yes.

  The clamp sensor according to claim 1 and the measuring device according to claim 7, wherein the clamp sensor includes a main body portion at least at one end side formed in a column body, and at least one base portion is rotated toward one end side of the main body portion. A pair of clamp arms connected in a free state, a biasing portion that constantly biases at least one of the clamp arms in a direction in which the tip opens, and a length direction of this portion on the outer periphery of a portion on one end side of the main body portion And an open / close cover that is slidably fitted along the open / close direction, and the pair of clamp arms is opened / closed by sliding the open / close cover along the length direction.

  Therefore, according to the clamp sensor and the measuring apparatus, after the main body is held with one hand and the main body is moved and the measurement object such as an electric wire is introduced between the pair of clamp arms, the main body is The object to be measured is closed by moving the open / close cover to the pair of clamp arms along the length direction of the one end side of the main body without moving the pair of clamp arms. Can be clamped. Thus, according to the clamp sensor and the measurement device, unlike the conventional clamp sensor and the measurement device including the clamp sensor, the main body is moved with respect to the measurement object in accordance with the operation of sliding the opening / closing cover. Therefore, it is possible to easily clamp the measurement object. Moreover, according to this clamp sensor and measuring apparatus, since it is not the structure which accommodates a pair of clamp arm in a main-body part, the conventional clamp sensor which accommodates a pair of clamp arm in a main-body part, and a measuring apparatus provided with this clamp sensor In addition, the internal structure of the main body can be simplified.

  According to the clamp sensor according to claim 2 and the measuring device according to claim 7, the pair of clamp arms is provided at a portion that contacts the outer peripheral surface of at least one clamp arm at the tip of the pair of clamp arms of the opening / closing cover. A biasing member that biases the outer peripheral surface of at least one of the clamp arms against the biasing force of the biasing portion in a closed state when the tip of the arm is closed (closed state) is disposed Has been. Therefore, according to this clamp sensor, due to the presence of the biasing member, the pair of clamp arms can be maintained in a closed state (a state in which the measurement object is clamped) without rattling.

  According to the clamp sensor of the third, fourth, fifth, and sixth aspects and the measuring device of the seventh aspect, since the lock mechanism is provided, the state in which the ends of the pair of clamp arms are closed by the opening / closing cover. It can be reliably maintained.

FIG. 3 is a perspective view showing a configuration of the clamp sensor 1 in a state where a pair of clamp arms 3 and 4 are opened. FIG. 2 is a front view of the clamp sensor 1 of FIG. 1 (the open / close cover 6 is shown cut along a plane perpendicular to the axis L). FIG. 3 is a perspective view showing a configuration of the clamp sensor 1 with a pair of clamp arms 3 and 4 closed. FIG. 4 is a front view of the clamp sensor 1 of FIG. 3 (the open / close cover 6 is shown cut along a plane perpendicular to the axis L). It is explanatory drawing in the state where the clamp arms 3 and 4 about the clamp sensor 1A for demonstrating a structure of the locking mechanism 31A open. It is explanatory drawing in the state where the clamp arms 3 and 4 about the clamp sensor 1A for demonstrating a structure of the lock mechanism 31A were closed. It is explanatory drawing in the state where the clamp arms 3 and 4 about the clamp sensor 1B for demonstrating a structure of the locking mechanism 31B open. It is explanatory drawing in the state where the clamp arms 3 and 4 about the clamp sensor 1B for demonstrating a structure of the locking mechanism 31B were closed. It is explanatory drawing in the state where the clamp arms 3 and 4 about the clamp sensor 1C for demonstrating a structure of the locking mechanism 31C open. It is explanatory drawing in the state where the clamp arms 3 and 4 about the clamp sensor 1C for demonstrating a structure of the locking mechanism 31C were closed. It is a block diagram which shows the structure of the measuring apparatus 51 provided with the clamp sensor 1 (1A, 1B, 1C).

  Hereinafter, embodiments of the clamp sensor 1 and the measuring device 51 will be described with reference to the accompanying drawings.

  First, the configuration of the clamp sensor 1 will be described with reference to the drawings.

  As shown in FIGS. 1 to 4, the clamp sensor 1 includes a main body 2, a pair of clamp arms 3 and 4, an urging portion 5, and an opening / closing cover 6, and a pair of clamp arms 3 as shown in FIG. 4. , 4 (measurement object wire 7 (in this example, measurement object wire 7 (measurement object wire 7 inserted into a hole HL, which will be described later) formed between the clamp arms 3 and 4 with the tip closed) )) Is detected.

  The main body 2 is made of a synthetic resin material, and as shown in FIGS. 1 to 4, at least a part A on one end side is a column (polygonal column or cylinder (in this example, as an example, some unevenness on the surface). The main body 2 is formed at one end thereof (upper end in the vertical direction in the figure, that is, upper end of the part A on one end side). The connecting portion 2a is formed, and the base portions (lower end portions) of the pair of clamp arms 3 and 4 are connected to the connecting portion 2a so as to be rotatable about the axis L.

  Moreover, as for the main-body part 2, the site | part A of the one end side is formed more narrowly than the site | part B of the other end side. Specifically, as shown in FIG. 2, the peripheral surface of the part A in the peripheral surface (the front surface, the back surface, and each side surface in FIG. 2) of the main body 2 formed in a rectangular parallelepiped is the peripheral surface of the part B The part A is formed more narrowly than the part B by being dug down more uniformly by the thickness d1 of the opening / closing cover 6 than the part B. Further, as will be described later, the opening / closing cover 6 is slidably attached (externally fitted) to the part A of the main body 2.

  As shown in FIGS. 1 and 2, the clamp arm 3 includes a core case 11 formed in an arc shape in plan view, and the clamp arm 4 includes a core case 12 formed in an arc shape in plan view. Each of the core cases 11 and 12 is formed using a synthetic resin material, and at least one (both in this example) base portion is rotatably connected to the connecting portion 2a of the main body portion 2 by the shaft 2b as described above. Thus, the tip (the upper end in the figure) is configured to be openable and closable. Further, as shown in FIGS. 3 and 4, the core cases 11 and 12 are inserted with the measurement target wire 7 between the core cases 11 and 12 when the tips are closed (the tips of the clamp arms 3 and 4 are also closed). One annular body in which possible holes HL are formed is formed.

  As shown in FIG. 2, the core case 11 includes an arc-shaped core 13, and the core case 12 includes an arc-shaped core 14. Further, as shown in FIG. 4, the cores 13 and 14 are in a state in which the corresponding end portions are separated from each other when the tips of the core cases 11 and 12 are open, as shown in FIG. When the tips of the core cases 11 and 12 are closed, the corresponding end portions are joined to each other. In a state in which the end portions are joined, the cores 13 and 14 constitute one closed magnetic circuit.

  In addition, at least one of the core cases 11 and 12 detects a magnetic flux generated in each of the cores 13 and 14 formed in a closed magnetic circuit by a current flowing through the measurement target electric wire 7 and outputs it as an electric signal. A sensor (such as a hall element or a coil wound around at least one of the cores 13 and 14) is incorporated.

  As shown in FIGS. 2 and 4, the urging portion 5 is disposed in the main body portion 2 and constantly urges at least one of the core cases 11 and 12 in the direction in which the tips of the core cases 11 and 12 open. (That is, at least one clamp arm of the pair of clamp arms 3 and 4 is always urged in the direction in which the ends of the pair of clamp arms 3 and 4 open).

  In this example, as an example, the urging portion 5 is configured such that the coil portion is externally fitted to the shaft 2 b disposed in the connecting portion 2 a of the main body portion 2, and the tip ends of the pair of arm portions are provided in the core cases 11 and 12. It is configured by a torsion coil spring that is inserted into the engaging portions 11a, 12a and that constantly urges each of the core cases 11, 12 in the direction in which the tip is opened. In addition, about the biasing part 5, it is not limited to a torsion coil spring, The structure which uses a leaf | plate spring, a coil spring, etc. can also be employ | adopted.

  The opening / closing cover 6 is formed using a synthetic resin material, and, as shown in FIGS. 1 to 4, the length direction of the part A (on the outer periphery of the part A on one end side formed in the column of the main body 2 ( It is slidable along the vertical direction in FIGS. 1 to 4 and is externally fitted (attached) with little backlash.

  Specifically, the opening / closing cover 6 includes a slide cylinder portion 21 and a cover portion 22. The slide cylinder portion 21 is formed in a cylinder body (in this example, the square cylinder body because the portion A is a rectangular parallelepiped) that matches the outer shape of the portion A on one end side of the main body portion 2, and is slidable on the portion A. It is fitted (attached).

  The cover part 22 is formed integrally with the slide cylinder part 21 at the end part on the core case 11, 12 side of the slide cylinder part 21. Specifically, the cover portion 22 includes each of the wall portions 21a, 21b on the core case 11, 12 side of the wall portions 21a, 21b orthogonal to the axis L of the four wall portions 21a, 21b, 21c, 21d constituting the slide cylinder portion 21. At the end portions, the wall portions 22a and 22b extending toward the core cases 11 and 12 and the end portions of the wall portions 21c and 21d perpendicular to the wall portions 22a and 22b on the core case 11 and 12 side. Wall portions 22c and 22d extending toward the core cases 11 and 12 are provided.

  In this case, the wall portions 22a and 22b face each other in parallel with the core cases 11 and 12 interposed therebetween, and the distance between them is defined to be slightly wider than the thickness d2 of the core cases 11 and 12. Yes. The shape of the walls 22a and 22b viewed from the direction of the arrow W (the direction parallel to the axis L) in FIGS. 1 and 3 is formed in a trapezoidal shape that gradually increases in width as the distance from the walls 21a and 21b increases. . Note that the trapezoidal shape in this example is a trapezoid formed by a curved surface in which the side corresponding to the hypotenuse of the trapezoid swells outward, but the side corresponding to the hypotenuse is a trapezoid formed by a straight line. You can also. Further, as shown in FIG. 3, the wall portions 22 a and 22 b are configured so that the opening and closing cover 6 is slid in the direction of the core cases 11 and 12 and the ends of the pair of clamp arms 3 and 4 are closed. In order not to cover the hole HL formed between the four, it is cut out so as to be substantially arcuate in plan view along the inner peripheral surfaces of the core cases 11 and 12.

  As shown in FIGS. 1 to 4, the remaining wall portions 22 c and 22 d gradually spread as the distance from each wall portion 21 c and 21 d increases, and the wall portion 22 c extends to the outer peripheral surface of the core case 11. The wall portions 22d extend to the end portions of the corresponding wall portions 21c and 21d so that the wall portions 22d extend to the outer peripheral surface of the core case 12. Each of the wall portions 22c and 22d is formed with a slit SL formed between the wall portions 22a and 22b (see FIGS. 1 and 3. Note that the slit SL on the side of the wall portion 22c is hidden in the core case 11 in FIG. However, it is separated from the wall portions 22a and 22b except for a part of the region on the wall portions 21c and 21d side. Combined with this configuration and the fact that the opening / closing cover 6 is made of an elastic synthetic resin material, each of the wall portions 22c and 22d has end portions on the core case 11 and 12 side (the core cases 11 and 12). An end portion extending to the outer peripheral surface, which functions as an elastic piece having a free end portion of the opening / closing cover 6 and is closed in the core cases 11 and 12 (that is, the clamp arms 3 and 4 in the closed state) ) In the closing direction. In this case, the urging force of each of the wall portions 22 c and 22 d when functioning as an elastic piece is defined more strongly than the urging force of the urging portion 5.

  Next, the operation when the measurement target electric wire 7 is clamped by the clamp sensor 1 will be described together with the operation of the clamp sensor 1 at that time.

  First, before clamping the measurement target electric wire 7 with the clamp sensor 1, the part B of the main body 2 is held by one hand and the opening / closing cover 6 is held by the other hand. Slide (slide) to the B side (direction away from the clamp arms 3, 4; the other end of the main body 2). In this case, as shown in FIGS. 1 and 2, sliding of the opening / closing cover 6 (sliding downward in the drawing) is an end portion (lower end portion in the drawing) of the sliding cylinder portion 21 of the opening / closing cover 6. Is regulated at the time when it comes into contact with the stepped portion present at the boundary between the part A and the part B of the main body 2.

  At this time, as the opening / closing cover 6 moves downward, the free end portions of the wall portions 22c, 22d constituting the cover portion 22 of the opening / closing cover 6 and the outer peripheral surfaces formed in the arc shape of the core cases 11, 12 are formed. The abutting position P also moves downward (moves toward the base part of the core cases 11 and 12 (the part connected by the shaft 2b in the connecting part 2a)). For this reason, the core cases 11 and 12 (that is, the clamp arms 3 and 4) are rotated by the urging force constantly applied from the urging portion 5, and the tips thereof are gradually opened. The rotation by the urging force of the urging portion 5 of the core cases 11 and 12 (that is, the clamp arms 3 and 4) stops when the downward sliding of the opening / closing cover 6 is restricted as described above. However, in the clamp sensor 1, the distance (opening width) between the tips of the core cases 11 and 12 (that is, the clamp arms 3 and 4) in this state is as shown in FIG. Is defined such that the measurement target electric wire 7 having the largest outer diameter can be introduced between the core cases 11 and 12.

  When the sliding of the opening / closing cover 6 is restricted, as shown in FIG. 2, the contact position P is slightly above the shaft 2b to which the base portions of the core cases 11 and 12 are connected. Since the core cases 11 and 12 are in a state where most of the core cases 11 and 12 are exposed from the cover portion 22 of the opening / closing cover 6, the base side is covered with the cover portion 22. Therefore, even if a force in the torsional direction acts on the core cases 11 and 12 in the open state, the wall portions 22a and 22b are formed so that the distance between them is slightly larger than the thickness d2 of the core cases 11 and 12. The twisting of the core cases 11 and 12 is minimized by contacting the outer peripheral surfaces of the core cases 11 and 12.

  Next, as shown in FIG. 2, in a state where the measurement target wire 7 to be measured is introduced between the core cases 11 and 12, the open / close cover 6 is slid to the clamp arms 3 and 4 side (upward in FIG. 2) ( Slide). At this time, as the opening / closing cover 6 moves upward, the contact position P between the free ends of the walls 22c and 22d and the outer peripheral surfaces of the core cases 11 and 12 also moves upward (core cases 11 and 12). Apart from the base at For this reason, the core cases 11 and 12 (that is, the clamp arms 3 and 4) are rotated in the reverse direction against the urging force from the urging portion 5 by the wall portions 22c and 22d, and the tip ends thereof. Close gradually.

  At this time, the positions of the clamp arms 3 and 4 with respect to the main body 2 where the part B is held by one hand do not change. For this reason, unlike the conventional clamp sensor, it is not necessary to move the main body 2 with respect to the measurement target wire 7 in accordance with the operation of sliding the opening / closing cover 6, and thus the measurement target wire 7 is easily clamped. It is possible.

  3 and 4, the open / close cover 6 is moved to a position slightly above the position where the tips of the core cases 11 and 12 (that is, the clamp arms 3 and 4) are completely closed. At that time, the upward movement is restricted by the frictional force between the free ends of the walls 22c and 22d and the outer peripheral surfaces of the core cases 11 and 12 generated at the contact position P. The opening / closing cover 6 is also restrained from moving downward by this frictional force. Therefore, at this position, even if the hand is released from the opening / closing cover 6, the opening / closing cover 6 is maintained in a stopped state at this position. In this state, the wall portions 22c and 22d function as elastic pieces, and always apply a biasing force in the direction of maintaining the closed state to the core cases 11 and 12. Thereby, the core cases 11 and 12 (that is, the clamp arms 3 and 4) maintain the closed state (the state in which the measurement target electric wire 7 is clamped) without rattling.

  Further, when the upward sliding of the opening / closing cover 6 is restricted, as shown in FIG. 4, the center of the core cases 11 and 12 in which the contact position P is formed in an annular shape as a whole (this example) Then, since the core cases 11 and 12 are located slightly below the center HL of the hole HL, about half of the area on the base side is covered with the cover portion 22. Therefore, even if a torsional force acts on the core cases 11 and 12, the wall portions 22 a and 22 b formed so that the distance between the core cases 11 and 12 is slightly larger than the thickness d2 of the core cases 11 and 12. The twist which arises in the core cases 11 and 12 by contacting the outer peripheral surface of 12 is suppressed to the minimum.

  After that, when the clamp of the measurement target electric wire 7 by the pair of clamp arms 3 and 4 is released, between the free ends of the wall portions 22c and 22d generated at the contact position P and the outer peripheral surfaces of the core cases 11 and 12 The opening / closing cover 6 is slid (slid) in the region B side (in the direction away from the clamp arms 3 and 4) against the frictional force. As a result, the contact position P between the free ends of the walls 22c and 22d and the outer peripheral surfaces of the core cases 11 and 12 also moves downward, so that the core cases 11 and 12 (that is, the clamp arms 3 and 4) are attached. It is rotated by the urging force from the urging portion 5 (the rotation against the urging force is released), and its tip is opened. Therefore, the clamp of the measurement target electric wire 7 by the pair of clamp arms 3 and 4 is released.

  Thus, in this clamp sensor 1, at least one end portion A is formed in the column body 2, and at least one (both in this example) base portion is rotatable to one end side of the body portion 2. A pair of clamp arms 3, 4 connected in a state, a biasing portion 5 that constantly biases the pair of clamp arms 3, 4 in the direction in which the tip is opened, and an outer periphery of a portion A on one end side of the main body 2. An opening / closing cover 6 slidably fitted along the length direction of the portion A, and sliding the opening / closing cover 6 along the length direction causes the pair of clamp arms 3, 4 to move. Open and close.

  Therefore, according to the clamp sensor 1, after the body part 2 is moved while holding the part B of the body part 2 with one hand and the measurement target electric wire 7 is introduced between the pair of clamp arms 3 and 4, By simply sliding the opening / closing cover 6 toward the clamp arms 3 and 4 along the length direction of the portion A without moving the main body 2, the ends of the clamp arms 3 and 4 are closed. The measurement target electric wire 7 can be clamped. Thereby, according to this clamp sensor 1, since it is not necessary to move the main-body part 2 with respect to the measuring object electric wire 7 according to operation which slides the opening-and-closing cover 6, unlike the conventional clamp sensor, The target electric wire 7 can be easily clamped.

  Moreover, according to this clamp sensor 1, since it is not the structure which accommodates the clamp arms 3 and 4 in the main-body part 2, the internal structure of the main-body part 2 is compared with the conventional clamp sensor which accommodates a clamp arm in a main-body part. A simple configuration can be achieved.

  Further, in the clamp sensor 1, a portion that contacts the outer peripheral surface of the clamp arms 3, 4 (specifically, the outer peripheral surface of the core cases 11, 12) at the distal end portion of the open / close cover 6 on the clamp arm 3, 4 side. When the tip ends of the clamp arms 3 and 4 are closed (closed state), the outer peripheral surface of the clamp arms 3 and 4 (specifically, the outer peripheral surfaces of the core cases 11 and 12) is biased by the urging portion 5. Wall portions 22c and 22d functioning as urging members (elastic pieces) for urging in the direction of maintaining the closed state against the urging force are provided.

  Therefore, according to this clamp sensor 1, due to the presence of the wall portions 22c and 22d, the core cases 11 and 12 (that is, the clamp arms 3 and 4) are closed in a state where there is no backlash (the measurement target electric wire 7 is removed). The clamped state can be maintained.

  In addition, in this example, the structure which makes one part wall part 22c, 22d itself of the wall parts 22a-22d which comprise the cover part 22 of the opening / closing cover 6 function as an urging | biasing member (elastic piece) is employ | adopted. However, it is also possible to adopt a configuration in which an urging member that urges against the outer peripheral surface of the core cases 11 and 12 is separately arranged inside the wall portions 22c and 22d.

  In the clamp sensor 1 described above, the opening and closing cover 6 closes the ends of the core cases 11 and 12 (that is, the clamp arms 3 and 4), and the free ends of the wall portions 22c and 22d and the core case 11 and 12 is employed, and is maintained between the opening / closing cover 6 and the main body 2 and between the opening / closing cover 6 and a pair of clamp arms 3 and 4 (specifically. Is closed to the pair of clamp arms 3 and 4 between either one of the core cases 11 and 12) constituting the clamp arms 3 and 4, and the tips of the clamp arms 3 and 4 are closed. It is also possible to employ a configuration in which a lock mechanism that locks (regulates) the movement of the main body portion 2 of the opening / closing cover 6 being shifted to the state to the side B is provided. By adopting this configuration, it is possible to more reliably maintain the state in which the ends of the core cases 11 and 12 are closed by the opening / closing cover 6.

  Hereinafter, three specific examples of the lock mechanism will be described with reference to clamp sensors 1A, 1B, and 1C shown in FIGS. Since the configuration other than the lock mechanism is substantially the same as the configuration shown in FIGS. 1 to 4, the same or substantially the same configuration is denoted by the same reference numeral, and redundant description is omitted. 5 to 10, the lock mechanisms 31A, 31B. In order to facilitate understanding of the configuration of 31C, the configurations of the clamp sensors 1A, 1B, and 1C are illustrated in a simplified manner, and hatched lines are provided for clearly showing the cross-sectional shape of only necessary members.

  First, a first specific example (lock mechanism 31A) of the lock mechanism will be described with reference to the clamp sensor 1A shown in FIGS. The lock mechanism 31A includes a ball plunger 41 disposed inside the part A of the main body 2 and an engagement recess 42 formed on the inner surface of the open / close cover 6A. Between the two. The open / close cover 6 </ b> A has the same configuration as the open / close cover 6 of the clamp sensor 1 except for the engagement recess 42.

  In the clamp sensor 1A, as shown in FIG. 6, when the opening / closing cover 6A is slid to the position where the tips of the clamp arms 3 and 4 are closed, one of the balls 41a protruding from the surface of the part A of the main body 2 is provided. The part fits into the engaging recess 42. Thereby, the state which closed the tip of core cases 11 and 12 with opening-and-closing cover 6A is maintained more reliably. In addition, by applying a force in the direction of sliding to the part B side along the length direction of the part A of the main body 2 to the opening / closing cover 6A, the engaging recess 42 is shifted from the position of the ball 41a, thereby opening / closing cover 6A. Can be slid to the part B side of the main body 2 (that is, the tips of the clamp arms 3 and 4 can be opened).

  Next, a second specific example (lock mechanism 31B) of the lock mechanism 31 will be described with reference to the clamp sensor 1B shown in FIGS. The lock mechanism 31B includes an engaging claw 43 having elasticity formed on a tip portion of the opening / closing cover 6B (specifically, inner surfaces of the wall portions 22c and 22d constituting the opening / closing cover 6B) and a pair of clamp arms 3. , 4 (specifically, engaging recesses 44 formed on the outer peripheral surfaces of the core cases 11B, 12B constituting the clamp arms 3, 4). As shown in FIG. 8, the engagement recess 44 is formed at a position where the engagement claw 43 is fitted when the opening / closing cover 6 </ b> B is slid to a position where the front ends of the clamp arms 3 and 4 are closed. .

  In the clamp sensor 1B having the lock mechanism 31B, as shown in FIG. 7, when the distal ends of the pair of clamp arms 3 and 4 are open, the distal ends of the wall portions 22c and 22d are the outer circumferences of the core cases 11B and 12B. The engaging claw 43 is in contact with the surface and is not in contact with the outer peripheral surfaces of the core cases 11B and 12B. Thus, when the opening / closing cover 6B is slid toward the clamp arms 3 and 4 in order to close the tips of the pair of clamp arms 3 and 4, initially, the walls are in contact with the outer peripheral surfaces of the core cases 11B and 12B. The clamp arms 3 and 4 are gradually closed by the tips of the portions 22c and 22d, and a pair of engagements are started slightly before the transition to the state shown in FIG. 8 (the state in which the engagement claws 43 are fitted in the engagement recesses 44). The claws 43 begin to contact the outer peripheral surfaces of the core cases 11B and 12B, and thereafter, for a while, the ends of the clamp arms 3 and 4 are gradually closed by the pair of engagement claws 43. Thereafter, when the tips of the clamp arms 3 and 4 are completely closed, and when the opening / closing cover 6B is further slid from this state, the pair of engaging claws 43 are once elastically deformed in the direction in which the distance between them is increased. After that, as shown in FIG. 8, the core cases 11 </ b> B and 12 </ b> B are sandwiched between the engagement recesses 44. At this time, the ends of the wall portions 22c and 22d are in contact with the outer peripheral surfaces of the core cases 11B and 12B again.

  Therefore, in this clamp sensor 1, in the state shown in FIG. 8, the pair of engaging claws 43 function as elastic pieces and apply a biasing force in a direction to maintain the closed state with respect to the core cases 11B and 12B. Let it work all the time. Thereby, in this clamp sensor 1, core case 11B, 12B (namely, clamp arm 3 and 4) can be maintained in the closed state (state which clamped the measuring object electric wire 7) in the state without rattling. In addition, by applying a force in the direction of sliding to the part B side along the length direction of the part A of the main body part 2 to the opening / closing cover 6B, each engaging claw 43 is shifted from the position of the engaging recess 44, The opening / closing cover 6B can be slid to the part B side of the main body 2 (that is, the tips of the clamp arms 3 and 4 can be opened).

  Next, a third specific example of the lock mechanism 31 will be described with reference to FIGS. The lock mechanism 31C includes a lock lever 45 disposed on the opening / closing cover 6C so as to be swingable about an axis M (parallel to the axis L). The lock lever 45 is configured such that an engaging convex portion 46 is formed on a surface facing the main body portion 2 at an end portion on the pair of clamp arms 3 and 4 side. Further, a hole 47 is formed in a portion corresponding to the engaging convex portion 46 of the opening / closing cover 6C. The opening / closing cover 6C has the same configuration as the opening / closing cover 6 of the clamp sensor 1 except that the lock lever 45 is provided and the hole 47 is formed in this way.

  In the lock mechanism 31C, as shown in FIG. 10, the lock lever 45 is operated (specifically, the lock lever 45 in a state where the opening / closing cover 6C is slid to the position where the tips of the clamp arms 3 and 4 are closed). The end of the engaging convex portion 46 is moved from the hole 47 to the main body 2 side by swinging the lock lever 45 around the axis M. Make it protrude. Thereby, the front end of the engagement convex portion 46 protrudes from the inner surface of the opening / closing cover 6C and engages with the main body 2 (in this example, to engage with one end of the main body 2). Movement is restricted.

  Further, regarding the restriction of the movement of the opening / closing cover 6C by the lock mechanism 31, the lock lever 45 is operated (specifically, the other end of the lock lever 45 on the part B side of the main body 2 is moved to the main body 2 side). The lock lever 45 is swung in the reverse direction about the axis M, and the protrusion of the engagement convex portion 46 from the hole 47 is released to release the lock lever 45. Thus, since the lock mechanism 31 is configured to engage the main body 2 with the engagement convex portion 46 formed on the lock lever 45, the lock mechanism 31 is disposed between the open / close cover 6C and the main body 2. Function as.

  In the clamp sensors 1, 1 A, 1 B, and 1 C, both the pair of clamp arms 3 and 4 are rotatably arranged with respect to the main body 2, and the clamp arms 3 and 4 are connected to the opening / closing cover 6. , 6A, 6B, 6C, but only one of the pair of clamp arms 3, 4 is rotatably arranged with respect to the main body 2 and the other is the main body 2. Fixedly arranged with respect to (configured as a fixed clamp arm), and only one of the pivotally arranged clamp arms is brought into contact with and separated from the other clamp arm with an opening / closing cover (opening / closing) It is also possible to adopt a configuration that allows

  Further, as shown in FIG. 11, the clamp sensors 1, 1A, 1B, and 1C are measuring units that measure a measured amount based on the detected amounts detected by the clamp sensors 1, 1A, 1B, and 1C. 52 can be configured as a measuring device 51. In this case, a physical quantity sensor (at least one of a current sensor, a voltage sensor, and a temperature sensor) or a chemical quantity sensor (density) is provided on at least one of the clamp arms 3 and 4 of the clamp sensors 1, 1A, 1B, and 1C. By storing or adding at least one of a sensor and a component sensor, etc., it is possible to measure physical quantities such as current, voltage and temperature, and chemical quantities such as density and components as measured quantities. Become.

  Moreover, although the electric wire (measuring electric wire 7) was mentioned as an example as a measuring object, the flow rate and temperature of the water which flows into a water pipe are measured by using a water pipe, a gas pipe, etc., or a gas pipe Needless to say, the clamp sensors 1, 1A, 1B, and 1C described above can be applied to a clamp sensor that measures the flow rate and temperature of the gas flowing through the gas sensor.

1, 1A, 1B, 1C Clamp sensor 2 Main body part 3, 4 Clamp arm 5 Energizing part 6, 6A, 6B, 6C Opening / closing cover 7 Wire to be measured 22c, 22d Wall part 31A, 31B, 31C Lock mechanism 51 Measuring device

Claims (7)

A main body having at least one end portion formed in a column, and
By connecting at least one base portion to the one end side of the main body portion in a rotatable state, the tip end of the at least one is configured to be openable and closable and formed between each other in a state in which the tip end is closed. A pair of clamp arms through which the measurement object can be inserted into the hole,
A biasing portion that constantly biases the at least one clamp arm of the pair of clamp arms in a direction in which the tip opens;
An opening / closing cover that is slidably fitted along the length direction of the part on the outer periphery of the part on the one end side of the main body part;
When the opening / closing cover is slid toward the pair of clamp arms along the length direction, the distal end portion of the opening / closing cover extending from the one end side of the main body portion to the pair of clamp arm sides is Abutting the outer peripheral surface of at least one clamp arm and rotating the at least one clamp arm against the urging force of the urging portion to shift the distal ends of the pair of clamp arms to a closed state; When the opening / closing cover is slid along the length direction to the other end side of the main body, the urging force of the urging portion against the at least one clamp arm by the distal end portion of the opening / closing cover is resisted. A clamp sensor in which rotation is released and the tip ends of the pair of clamp arms shift to an open state.   The portion of the front end portion of the opening / closing cover that contacts the outer peripheral surface of the at least one clamp arm has the outer peripheral surface of the at least one clamp arm when the front ends of the pair of clamp arms are closed. The clamp sensor according to claim 1, wherein a biasing member that biases in a direction to maintain the closed state against the biasing force of the biasing portion is disposed.   The front ends of the pair of clamp arms are slid to the clamp arm side between the open / close cover and the main body and between the open / close cover and the at least one clamp arm. The clamp sensor according to claim 1 or 2, further comprising: a lock mechanism that locks movement of the main body portion of the opening / closing cover that is shifted to a closed state to the other end side.   4. The clamp sensor according to claim 3, wherein the lock mechanism includes a ball plunger disposed in the main body portion and an engagement recess formed in the opening / closing cover and into which a ball of the ball plunger is fitted.   The lock mechanism includes an engaging claw formed at the tip of the opening / closing cover, and an engaging recess formed in the pair of clamp arms and into which the engaging claw is fitted. The clamp sensor described.   The clamp sensor according to claim 3, wherein the lock mechanism is configured by a lock lever disposed on the opening / closing cover and having an engaging convex portion that engages with the one end side.   7. A measuring apparatus comprising: the clamp sensor according to claim 1; and a measurement unit that measures a measurement amount based on a detection amount detected by the clamp sensor.

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